A204421 - cp's OEIS frontend

A204421 Symmetric matrix: f(i,j)=(i+j+2 mod 3), by antidiagonals.

n	a(n)
1	1
2	2
3	2
4	0
5	0
6	0
7	1
8	1
9	1
10	1
11	2
12	2
13	2
14	2
15	2
16	0
17	0
18	0
19	0
20	0
21	0
22	1
23	1
24	1
25	1
26	1
27	1
28	1
29	2
30	2
31	2
32	2
33	2
34	2
35	2
36	2
37	0
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	1
47	1
48	1
49	1
50	1
51	1
52	1
53	1
54	1
55	1
56	2
57	2
58	2
59	2
60	2
61	2
62	2
63	2
64	2
65	2
66	2
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	1
80	1
81	1
82	1
83	1
84	1
85	1
86	1
87	1
88	1
89	1
90	1
91	1
92	2
93	2
94	2
95	2
96	2
97	2
98	2
99	2

[1, 2, 2, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2]

cp's OEIS Frontend

A204421 Symmetric matrix: f(i,j)=(i+j+2 mod 3), by antidiagonals.

Table of values

List of values

n	a(n)
1	1
2	2
3	2
4	0
5	0
6	0
7	1
8	1
9	1
10	1
11	2
12	2
13	2
14	2
15	2
16	0
17	0
18	0
19	0
20	0
21	0
22	1
23	1
24	1
25	1
26	1
27	1
28	1
29	2
30	2
31	2
32	2
33	2
34	2
35	2
36	2
37	0
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	1
47	1
48	1
49	1
50	1
51	1
52	1
53	1
54	1
55	1
56	2
57	2
58	2
59	2
60	2
61	2
62	2
63	2
64	2
65	2
66	2
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	1
80	1
81	1
82	1
83	1
84	1
85	1
86	1
87	1
88	1
89	1
90	1
91	1
92	2
93	2
94	2
95	2
96	2
97	2
98	2
99	2

n	a(n)
1	1
2	2
3	2
4	0
5	0
6	0
7	1
8	1
9	1
10	1
11	2
12	2
13	2
14	2
15	2
16	0
17	0
18	0
19	0
20	0
21	0
22	1
23	1
24	1
25	1
26	1
27	1
28	1
29	2
30	2
31	2
32	2
33	2
34	2
35	2
36	2
37	0
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	1
47	1
48	1
49	1
50	1
51	1
52	1
53	1
54	1
55	1
56	2
57	2
58	2
59	2
60	2
61	2
62	2
63	2
64	2
65	2
66	2
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	1
80	1
81	1
82	1
83	1
84	1
85	1
86	1
87	1
88	1
89	1
90	1
91	1
92	2
93	2
94	2
95	2
96	2
97	2
98	2
99	2

n	a(n)
1	1
2	2
3	2
4	0
5	0
6	0
7	1
8	1
9	1
10	1
11	2
12	2
13	2
14	2
15	2
16	0
17	0
18	0
19	0
20	0
21	0
22	1
23	1
24	1
25	1
26	1
27	1
28	1
29	2
30	2
31	2
32	2
33	2
34	2
35	2
36	2
37	0
38	0
39	0
40	0
41	0
42	0
43	0
44	0
45	0
46	1
47	1
48	1
49	1
50	1
51	1
52	1
53	1
54	1
55	1
56	2
57	2
58	2
59	2
60	2
61	2
62	2
63	2
64	2
65	2
66	2
67	0
68	0
69	0
70	0
71	0
72	0
73	0
74	0
75	0
76	0
77	0
78	0
79	1
80	1
81	1
82	1
83	1
84	1
85	1
86	1
87	1
88	1
89	1
90	1
91	1
92	2
93	2
94	2
95	2
96	2
97	2
98	2
99	2